Portion of a supporting base



FIG. 1 is a perspective view of a portion of a supporting base showing my design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a left side elevational view thereof.

Portions in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a supporting base, as shown and described. 